We use cookies to deliver essential features and to measure their performance. By using this site you accept our Privacy Policies.
A Complete Guide to the Solar System and the Night Sky
Donate Now! Help keep this site free and ads-free!
public Observing fromLocation: Greenwich, United Kingdom edit_location_alt
SunriseRise: 6:04  
clear_day Transit: 12:06  
SunsetSet: 18:09
wb_twilight Nautical TwilightWhat's Visible Now?
All Constellations » Perseus » 

HR641

Altitude: 24.7°   Azimuth: 21.6°   Direction: North-North-East

HR641 is a supergiant star in the constellation of Perseus.

HR641 visual magnitude is 6.44. Because of its reltive faintness, HR641 should be visible only from locations with dark skies, while it is not visible at all from skies affected by light pollution.

The proper motion of HR641 is -0.012 arcsec per year in Right Ascension and 0.02 arcsec per year in Declination and the associated displacement for the next 10000 years is represented with the red arrow.

Image of HR641 star
DSS2 image of HR641. The red arrow shows the motion of HR641 during the next 10000 years (-2.00 arcmin in Right Ascension and 3.33 arcmin in declination);

Key facts about HR641

6.44
Supergiant

HR641 is above the horizon from Greenwich, United Kingdom edit_location_alt.

Altitude: 24.7°
Azimuth: 21.6°
Direction: North-North-East

Celestial coordinates and finder chart of HR641

HR641 is situated north of the celestial equator, as such, it is more easily visible from the northern hemisphere. Celestial coordinates for the J2000 equinox as well as galactic coordinates of HR641 are provided in the following table:

02h 13m 41s
+58° 33’ 39”
133.5°
-2.61°
Perseus

The simplified sky map below shows the position of HR641 in the sky:

Finder chart HR641 star
Simplified finder chart for HR641.

Visibility of HR641 from your location

Location: Greenwich, United Kingdom edit_location_alt
Latitude: 51° 28’ 47” N
Longitude: 0° 00’ 00” E
Timezone: Europe/London

HR641 is circumpolar and transits at 14:23 UTC (altitude: 82.9°)

Distance of HR641 from the Sun and relative movement

HR641 is distant 2,884.96 light years from the Sun and it is moving towards the Sun at the speed of 41 kilometers per second.

884.96 pc
2,884.96 ly
-41 km/s
-0.012 arcsec/year
0.02 arcsec/year

Spectral properties of HR641

HR641 belongs to spectral class A3 and has a luminosity class of I corresponding to a supergiant star.

-3.29
A3I
5968K

The red dot in the diagram below shows where HR641 is situated in the Hertzsprung–Russell diagram.

HR Diagram
H-R diagram showing the position of HR641. Attribution: Richard Powell / CC BY-SA

Alternative designations of HR641

SAO23044
SAO23044